2. A steel leaflet holder containing a 'safety pin' type spring in a split steel cylinder which it forces apart after the plastic and cardboard bore of the holder has been blown out the forward end, pushing the other parts before it, by the black powder charge in;

3. The brass base time fuze which threads;

4. Into the steel motor tube male-threaded into;

5. The base containing multiple venturis in two concentric annular rings. Venturis in center ring vent in line of propulsion, those in outer ring have rotating inclination.